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ADV7172 Datasheet(PDF) 21 Page - Analog Devices

Part # ADV7172
Description  Digital PAL/NTSC Video Encoder with Six DACs 10 Bits, Color Control and Enhanced Power Management
PDF  59 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADV7172 Datasheet(HTML) 21 Page - Analog Devices

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ADV7172/ADV7173
–21–
REV. A
Mode 2: Master Option
HSYNC, VSYNC, BLANK
(Timing Register 0 TR0 = X X X X X 1 0 1)
In this mode the ADV7172/ADV7173 can generate horizontal and vertical SYNC signals. A coincident low transition of both
HSYNC and VSYNC inputs indicates the start of an odd field. A VSYNC low transition when HSYNC is high indicates the start of
an even field. The
BLANK signal is optional. When the BLANK input is disabled, the ADV7172/ADV7173 automatically blanks all
normally blank lines as per CCIR-624. Mode 2 is illustrated in Figure 30 (NTSC) and Figure 31 (PAL). Figure 32 illustrates the
HSYNC, BLANK and VSYNC for an even-to-odd field transition relative to the pixel data. Figure 33 illustrates the HSYNC,
BLANK and VSYNC for an odd-to-even field transition relative to the pixel data.
PAL = 12 * CLOCK/2
NTSC = 16 * CLOCK/2
HSYNC
VSYNC
BLANK
PIXEL
DATA
PAL = 132 * CLOCK/2
NTSC = 122 * CLOCK/2
Cb
Y
Cr
Y
Figure 32. Timing Mode 2 Even-to-Odd Field Transition Master/Slave
PAL = 864 * CLOCK/2
NTSC = 858 * CLOCK/2
PAL = 132 * CLOCK/2
NTSC = 122 * CLOCK/2
HSYNC
VSYNC
BLANK
PIXEL
DATA
PAL = 12 * CLOCK/2
NTSC = 16 * CLOCK/2
Cb
Y
Cr
Y
Cb
Figure 33. Timing Mode 2 Odd-to-Even Field Transition Master/Slave



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